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` two a space, C, for water.

Umani; STATES PATENT formera l ALBERT wrfNToN, on `HAGERsrown, inAiztvtnrn.l

iMPR'vEMENT iN` sTEAM-GENERATQRS.

`Speciiication forming part of LettersPatent o. l 86,511, dated January 23,1877 application filed i `November `28, 1876. p v

tain new and useful Improvements in Steam- Generators 5 and I dohereby declare that the following is a full, clear, and exact description thereof,'which will enable others skilled in the art to which it appertains to make and usethe same, reference being had to the accompanying drawings, and to `the letters of reference marked thereon, which form a partof this specication.

Figurell is -a sectional elevation on line a: :v of Fig. 3 5 Fig. 2, a transverse vertical section on'line y y'of Fig. l; Fig. 3, an end elevation, and Fig. 4 a side elevation.

This invention relates to that class of steamgenerators which are constructed with a viewof causing an active circulation of the water contained in them when they are in use 5 and it consists, first, inthe combination of a dou ble-arched fire-box', with an intervening circulating water-space, into which the water which passes through thetubes enters, and from which it is distributed to the other parts of the device; and, secondly, in combining with the pendent water-circulating space a series of inclined circulating-tubes, all as will be more fully explained hereinafter.

In constructing generators with my improvements attached, I make the shell A of rectangular or other suitable form, its upper surface being of the arched form shown' in Figs. 1, 3, and 4. The dimensions of the shell 4 A will vary according to the amount of steam which it is desirable to generate in it; but in all cases it will he of sufcient size to receive within it a fire-box, B, and leave between the The generator is to be supplied with grates D, andwith a redoor, E, and with hand-holes F, all of` which may be of any approved form, and- `be so located as to afford the greatest convenience for use, the hand-holes being `covered with plates, in the usual manner. In order that access may be had to the outer ends of 'the tubes, for the purpose of cleaning or repairing them, apertures G G are formed in the shell of the generator, as shown, said aperture being covered by plates G G', which are ,bolted to the shell A, and are stayed to the tube-sheets by fbolts passing through them and screwed Vinto said sheets.` At each end of the circulating water-space an aperture is formed, which is covered by plates, which `may be removed to permit a person to enter said space,'for,the purpose of removing or repairing the tubes; and man-holes and plates maybe provided at any other points where occasion may require. `In order that the greatest amount of steam may' be generated with the least vpossible amount of fuel, it is necessary that provision be made for an active circulation of the water in the different parts of the generator; and

that this function may be performed by my devices I arrange within the shell A a fire-box, B, the lower portion of which is a single compartment, which is supplied with grates for supporting the fuel. The upper portion of the fire-box is divided into two compartments, B1 and B2, they being separated by an intervening water-circulating chamber, B3, which extends downward suficiently far to allow it to receive the inner ends of the two series of tubes soon to be described. The upper snrface of the lire-box consists of two arched surfaces, which are arranged at right angles to the arched portion of the shell A, as a consequence of which the crown-sheets are rendered lmuch stronger, and less liable to be changed in form by the pressure ot' the steam upon them, owing to the fact that the circle described by their uppersnrfaces is of smaller diameter than it would be if it extended entirely across the fire-box.

These arches, as well as the lower portion of the Water-circulating chamber, may be strengthened,if necessary, by stay-bolts passing down through the crown-sheets.

In order that provision may be made for an active circulation of the water, two series of tubes, B4 B5, are provided, the outer ends of each series being secured in the side walls of the fire-box, and their inner ends in the side` walls of the circulatingchamber B3, said inner ends being elevated, as shown in Fig. 2, so as to cause them to stand at an angle from the horizon, and thus cause the water to iiow from the spaces outside of said fire-box through the tubes, and into the circulating-chamber 2 v y Y 186,511

B3, from which it will be distributedto the space above, and again return to the outer ends of the tubes preparatory to being again passed through them.

It will be seen that as arranged the fire passes around the tubes, and comes in contact with the interior surface of the arches of the fire-box, from which point the smoke and heated gases pass to the atmosphere through conduits H H', in doing which they superheat the steam in the steam-space which surrounds them to such an extent as to cause a considerable increase of its force, and without the expenditure of any extra fuel. These conduits may be provided with suitable dampers for regulating the draft.

Some of the advantages due to this form of generator may be enumerated as follows: First, it makes a generator which presents a large .amount of heating-surface within a small comly, it provides for the construction of large generators with strong crown-sheets; and, fourthly, it allows of a direct and strong draft for the furnace.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is-

1. The combination of the arched compartments B1 B2, having outlet-passages for the heated gases passing through the steam-space of the generator, and the centrally-located circulating-chamber B3, forming a division of the re-box into chambers B1 B2, and by which it is separated transversely, the parts being arranged to operate substantially as and for the purpose set forth. 2. The combination of the double-arched lire-box, arranged transversely across the generator, two series of inclined water-circulating tubes, and a central water-circulating space, the parts being constructed and arranged as shown and described.

In testimony that I claim the foregoing as my own I affix my signature in presence of two witnesses.

7ALBERT wINCroN.

Witnesses:

ELIAS E. ROHRER, THEO. 0. 'BEELEm 

